Display screen or portion thereof with user interface



FIG. 1 is a front view of a first embodiment of a display screen or portion thereof with user interface showing our new design; and,

FIG. 2 is a front view of a second embodiment of a display screen or portion thereof with user interface showing our new design.

The outermost broken lines illustrate a display screen or portion thereof and form no part of the claimed design. The remaining broken lines illustrate portions of the user interface that form no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with user interface, as shown and described. 